R. Lydekker—An Ichthyosaurus paddle. 389 
bones. They also showed that the pectoral limb had a broad flap 
of integument in the axillary region. Oblique striz, like those of 
the English specimen, were observed on the posterior flap of integu- 
ment, and were likewise held to be probably formed by muscular 
bundles; while the squamation of the anterior border of the fin was 
shown to be of a very minute and fine structure. 
So far as I know, the above is all the original literature which 
has appeared on this subject, and I proceed to notice the specimen 
on which the present communication is based. The specimen in 
question was kindly sent to me by Mr. Montagu Browne, of the 
Leicester Museum, who obtained it some time ago from the Lower 
Liassic quarries at Barrow-on-Soar. It consists of a split slab 
showing the imperfect thoracic region of a small Ichthyosaur clearly 
Ventral aspect of the imperfect left pectoral paddle of Ichthyosaurus intermedius ; 
from the Lower Lias of Barrow-on-Soar. 
Half nat. size. Aw. humerus; r. radius; «. ulna; 7”. radiale; 7. intermedium ; 
uw. ulnare; c.c’. centralia. 
referable to the Latipinnate group of the genus, and apparently 
belonging to I. intermedius. A large portion of the left pectoral 
limb is well preserved, the bones having been split in a plane 
parallel to the dorsal and ventral surfaces; although’ the distal 
extremity is unfortunately wanting. The half of the slab which 
best exhibits the paddle is the one in which, if the specimen were 
not split, we should look upon its ventral aspect; this view being 
represented in the accompanying woodcut. An inspection of this 
figure shows that the lateral flaps of integument are clearly marked 
on the slab, and that their general arrangement is the same as in 
the specimens previously described. On the narrow anterior 
flap a minute squamation can be detected with the aid of the 
